Several discourse corpora have been proposed in previous work, grounded with various discourse theories. Among them Rhetorical Structure Theory TreeBank (RST-DT) [1]} and Penn Discourse TreeBank (PDTB) [2]} are the most widely-used resources.
PDTB focuses on shallow discourse relations between two arguments and ignores the whole organization.
RST-DT based on Rhetorical Structure Theory (RST) [3]} represents a text into a hierarchical discourse tree.
Though RST-DT provides more comprehensive discourse information, its limitations including the introduction of intermediate nodes and absence of non-projective structures bring the annotation and parsing complexity.
